v2.3.0.11
Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2011
Asset Retirement Obligations  
Changes in Company's Liability for Asset Retirement Obligations

(in millions)

 

2011

 

 

2010

 

Balance as of January 1,

 

$

138.8

 

 

$

138.2

 

Accretion expense

 

 

0.3

 

 

 

0.4

 

Accretion recorded as a regulatory asset/liability

 

 

3.8

 

 

 

3.7

 

Settlements

 

 

(1.1

) 

 

 

(5.5

) 

Change in estimated cash flows

 

 

(2.9

) 

 

 

—  

 

 

 

 

 

 

 

 

 

Balance as of June 30,

 

$

138.9

 

 

$

136.8